Question: Name the chemical compound of the drug used to treat skin cancer.
Paraphrase: What is the chemical compound of the drug used to treat skin cancer?
SPARQL (Wikidata):  select distinct ?obj where { wd:Q192102 wdt:P2176 ?obj . ?obj wdt:P31 wd:Q11173 } 
Answer: fluorouracil, vemurafenib, imiquimod, ingenol mebutate, vismodegib, ipilimumab, dabrafenib